Definitions for "Remainder Mark"
Keywords:  marker, spray, stamp, collector, felt
A mark designating that the book did not sell at the published price. Leftover books were remaindered to wholesaler for discount sales. The mark is usually a stamp or a marker line across the bottom page edges.
(pertaining to modern books, especially first editions). A small stamp, usually ink, applied to one edge of the text block to indicate that the book was remaindered (sold discounted after initial publication). Since this is an indication of later release, it tends to be considered a detriment to the collector.
Usually reduced in price to make room for new stock, the publisher or retailer will mark the bottom edge of the book with a stroke or dot, often made with a felt marker, to distinguish the book from the regular stock.